package com.dmcb.common.business.utils;

import org.apache.commons.lang3.StringUtils;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * HTML工具类
 * <p/>
 * Created by long on 2015/4/4.
 */
public class HtmlUtil {

    private static final String regEx_script = "<script[^>]*?>[\\s\\S]*?<\\/script>"; // 定义script的正则表达式
    private static final String regEx_style = "<style[^>]*?>[\\s\\S]*?<\\/style>"; // 定义style的正则表达式
    private static final String regEx_html = "<[^>]+>"; // 定义HTML标签的正则表达式
    private static final String regEx_space = "\\s*|\t|\r|\n";//定义空格回车换行符
    private static final String regex_str = "<(?!img|br|p|/p).*?>";   //去除所有标签，只剩img,br,p

    public static String getContent(String htmlStr) {
        Pattern p_script = Pattern.compile(regex_str, Pattern.CASE_INSENSITIVE);
        Matcher m_script = p_script.matcher(htmlStr);
        htmlStr = m_script.replaceAll(""); // 过滤script标签
        return htmlStr.trim();
    }

    /**
     * @param htmlStr
     * @return 删除Html标签
     */
    public static String delHTMLTag(String htmlStr, boolean format) {
        Pattern p_script = Pattern.compile(regEx_script, Pattern.CASE_INSENSITIVE);
        Matcher m_script = p_script.matcher(htmlStr);
        htmlStr = m_script.replaceAll(""); // 过滤script标签

        Pattern p_style = Pattern.compile(regEx_style, Pattern.CASE_INSENSITIVE);
        Matcher m_style = p_style.matcher(htmlStr);
        htmlStr = m_style.replaceAll(""); // 过滤style标签

        Pattern p_html = Pattern.compile(regEx_html, Pattern.CASE_INSENSITIVE);
        Matcher m_html = p_html.matcher(htmlStr);
        htmlStr = m_html.replaceAll(""); // 过滤html标签

        if (format) {
            return  htmlStr.trim().replaceAll("&nbsp;", ""); // 格式化无需过滤空格回车标签
        }

        Pattern p_space = Pattern.compile(regEx_space, Pattern.CASE_INSENSITIVE);
        Matcher m_space = p_space.matcher(htmlStr);
        htmlStr = m_space.replaceAll(""); // 过滤空格回车标签
        return htmlStr.trim().replaceAll("&nbsp;", ""); // 返回文本字符串
    }

    public static String getTextFromHtml(String htmlStr) {
        if (StringUtils.isBlank(htmlStr)) {
            return "";
        }
        return delHTMLTag(htmlStr, false);
    }

    public static String formatTextFromHtml(String htmlStr) {
        if (StringUtils.isBlank(htmlStr)) {
            return "";
        }
        htmlStr = htmlStr.replace("<br>", "\n");
        return delHTMLTag(htmlStr, true);
    }

}
